What hard numbers? Sebelius has testified she doesn't know the numbers, everything is speculation. What is known is no money from the health exchange has been paid to the insurance companies for premiums as the back end is not complete. Instead the insurers have been given a form of a stipend or bulk partial payment to cover expenses and claims until they can complete it and actually get a look at who's actually covered and who's paid what.
You can find numbers if you are looking for them.
This is a rolling average. People who enrolled between 2/16 and 3/15 don't even start coverage until April 1st, while anyone who enrolls between 3/16 - 3/31 won't start coverage until May 1st. In many cases, their first month's premium won't even be due until up to 6 weeks or more after they enroll. Considering how many people wait until the last minute to pay their bills, it's silly to write these people off as deadbeats. The vast majority of these will eventually be paid up, it's just that we won't have confirmation of many of them until well into MAY.
http://acasignups.net/14/03/21/paidunpaid-brouhaha-updated